Core-making machine.



-No. 698,758. Patented Apr. 29; I902. l. B. THOMAS P.'CLARE.

CORE MAKING MACHINE.

(Application filed Aug. 14, 1900.) (No Model.) 2 Sheetsr-Shet I.

M/ITH E5856- m: Nonms vn'cas co. PHOYO-LITHOY. WASHINGTON, n. c,

Patented Apr. 29, I902.

I. B. THOMAS P. CLARE. GORE'MAKING MACHINE.

(Application filed Aug. 14, 1900.)

2 Sheets-Sheet 2.

(No Model.)

NITED STATES ISAAC B. THOMAS AND PETER CLARE, OF ALTOONA, PENNSYLVANIA.

CORE-MAKING MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 698,758, dated April29, 1902. Application filed August 14, 1900. Serial No. 26,344- lll0model.)

To ctZZ whom, it may concern:

Be it known that we, ISAAC B. THOMAS and PETER CLARE, citizens oftheUnited States of America, residing in the city of Altoona, in the countyof Blair, in the State of Pennsylvania, have invented certain new anduseful Improvements in Core-Making Machines, of which the following is atrue and exact description, reference being had to the accompanyingdrawings, which form a part thereof.

Ourinvention relates to machinery for making cores for casting out ofsand, the object of our invention being to provide a machine of greatsimplicity of construction in which sand cores can be made with greatrapidity; and with practically absolute homogeneity of' composition andcompression.

The nature of our improvements will be best understood as described inconnection with the drawings, in which they are illustrated, and inwhich- Figure 1 is a front view of our machine, shown partly in sectionon the line 1 1 of Fig. 3. Fig. 2 is a plan view showing the way inwhich the lid is secured to and operates in connection with thecore-box. Fig. 3 is a side elevation of the machine, taken on thesection-line 3 8 of Fig. 1. Fig. 4; is a cross-section on the line 4. 4of Fig. 3; Fig. 5, a crosssection on the line 5 5 of Fig. 3, and Fig. 6a cross-section on the line 6 6 of Fig. 3.

A indicates a platformor table for supporting the'sand, K indicatingback and rear walls for the table, and A an opening formed through thetable. The table, as shown, is supported on an angle-iron frame,(indicated at I 1,) J indicating a horizontal plate connecting the frontand rear angle-irons and se cured thereto by its bent ends J and J B isa bushing secured to the table so as to extend beneath the opening .A.Preferably this bushing extends flush with the top of the table and isprovided with an annular flange B by means of which it is bolted to theunder side of the table. It is also preferably formed with an annularrecess Bat its top to receive the top annular flange of the coreboxes 0,which are formed with annular flanges O and are adap'tedto fit nicely inthe bushing B, the core-boxes being readily removable, so that a numberof different sizes and forms may be used at will.

0 0 &c. indicate the longitudinal cavities forming the core-boxes, whichextend through the box 0 from end to end and have such conformation asis desired for the cores to be made. As shown, the core-box O is adaptedto make four cores at each operation of the machine.

D is a cover for the core-box, which [its over the top thereof when thebox is filled with sand and is secured with sufficient firmness toresist the upward thrust of the plungers, tobe described. As shown. thecover D is formed with an extension D, by means of which it is pivotedtoa bolt, and with an opposite extension D which when the cover is inposition on the core-box lies beneath alug D formed on a bolt D".

D indicates a handle by meansof which the lid is swung into and out ofposition to cover the core-box.

E E, 850., are plungers longitudinally movable in the box 0 and ofsufficient length to in their uppermost position come flush with or evenslightly above the top of the box 0. These plungers, as shown, aresecured to a platform E, which in turn is secured to a cross-head E thelaterally-extending arms E of the cross-head working on vertical rods EE which are secured at top to the bushing B and at bottom to the plateJ. For conveniencein taking up wear the arms E of the cross-head aresplit, as best shown in Figs. 5 and 6.

F (see Fig. l) is a stop which extends beneath the cross-head and servesto limit the lowermost position to which the plungers E can move in thecore-box, this position being that in which the core-box is charged withsand. This stop should be made adjustable, so as to provide fordifferent conditions, and this is conveniently done, as shown in thedrawings, by securingit to the end of an adj listing-screw F, supportedon the platform or plate J. 1

G is a connecting-rod extending from the cross-head E to a lever G,pivoted on a transversely extending rod; G and actuated, through a linkG by a treadle-lever G pivoted on a transverely-extendin g rod G Gindicating a foot-treadle.

H indicates a spring, the function of which is to balance the weight ofthe plungers, crosshead, and connecting devices, so that while theynormally rest in their lowermost position they can be moved upward withlittle more exertion than is necessary for the com pression' of thesand.

Of course it willhe understood that in place of the treadle mechanismshown any conven ient mode of applying power, either manual ormechanical, may be used without modification of our invention.

It is highly desirable not only that. the position of the plungersshould be uniform when the core-box is being charged with sand, but alsothat the movement of the plunger should be uniform in the actotcompressing the sand into cores, thus insuring not only that each coreshall be of the exactsize of the others, but also that each core shallcontain with substantial accuracy the same amount of sand, compressed tothe same degree. For this purpose we provide a movable stop to limit themovement of the plungers in compressing. This may be of any convenient lindas,for example, it may consist of a plate, as indicated at L,inserted between the plungers on the platform E and serving to arresttheir upward movement by coming in contact with the bottom of thecore-box O. This stop is removed when the cover D is also removed,permitting the plungers to move upward, carrying the cores with themuntil they are expelled from the core-box.

In operation, the core-box being empty, the plungers assume theirlowermost position-that defined by the stop Mand the lid D is swung toone side, leaving the top of the core-box open. Sand from the table A isthen swept into the core-box until it is full and the lid D swung intoposition, moving over the top of the core-box without com pacting thesand therein. The removable stop L being then in operative position, theplungers are moved upward by means of the treadle G compressing the sandin the corebox and beneath the cover I), until the upward motion of theplungers is arrested by the stop L, at which point the cores arecompleted. The cover D is then swung to one side and the removable stopL' removed, whereupon the plungers are given a further upward impulse,moving through the corebox and pushing the cores before them until thecores are delivered at the top of the box.

It will be seen that our construction is such as to permit of very easyand very prompt substitution of one core-box O for another, withcorrespondingly easy substitution of one plunger or set of plungers Efor another.

Having now described our invention, what we claim as new, and desire tosecure by Letters Patent, is-- 1. In a core-molding machine, a core-boxopen at top to receive sand and discharge cores, in combination with acover adjustable over the top of the core-box, one or more plungersworking through the bottom of the corebox and of length sufficient toreach the top thereof, a stop regulating the lowermost position of theplunger or plungers in the corebox, a stop forlimiting the upwardmovement of the plunger or plungers in pressing the cores said stopbeing removable when the cores are complete, and means for moving theplunger or plungers upward in the core-box to press the sand into coresand, after the removal of the cover and removable stop, to expel saidcores.

2. In a core-molding machine, a core-box open at top to receive sand anddischarge cores, in combination with a cover adjustable over the top ofthe core-box, one or more plungers working through the bottom of thecore-box and of length sufficient to reach the top thereof, anadjustable stop regulating the lowermost position of the plunger orplungers in the core-box, a stop for limiting the upward movement of theplunger or plungers in pressing the cores said stop being re movablewhen the cores are complete, and means for moving the plunger orplungers upward in the core-box to press the sand into cores and, afterthe removal of the cover and removable stop, to expel said cores.

3. In a core-molding machine, a table, as A, for holding loose sandhaving an opening, as A, in combination with acore-box receiving bushingB secured to the table and adapted to support a core-box with its topedge flush with the table, a core-box, as 0, open at top to receive sandand discharge cores, one or more plungers Working through the bottom ofthe core-box and of length sufficient to reach the top edge thereof, astop regulating the lowermost position of the plungers in the core-box,means for moving the plungers in the core-box, a removable stop forlimiting the upward movement of the plungers when compressing the sand,a sliding cover for the core-box and means for securing it on top of thesame during compression.

ISAAC B. THOMAS. PETER CLARE.

lVitnesses:

F. M. McOULLoUcn, WM. H. WEBER.

